Great St Lawrence Sea Conditions and Tide Table

Great St Lawrence Sea Conditions table showing wave height, swell direction and period.

High and low tide times are also provided on the table along with the moon phase and forecast weather. Sunrise today is at — and sunset is at 04:27 PM.

Days 1–4 Weather Summary

A heavy fall of snow, heaviest during Fri night. Becoming milder with light rain (total 5mm) on Sat morning. Icy conditions (max 2°C on Fri night, min -4°C on Fri morning). Mainly gales.

Days 5–7 Weather Summary

Moderate rain (total 10mm) heaviest on Tue morning, then becoming colder with a dusting of snow on Tue night. Icy conditions (max 5°C on Tue morning, min -3°C on Mon night). Mainly near gales.

Days 8–10 Weather Summary

A dusting of snow. Milder later with heavy rain (total 25mm) on Fri night. Freeze-thaw conditions (max 5°C on Fri night, min -5°C on Thu afternoon). Winds increasing (moderate winds from the SSW on Fri afternoon, near gales from the SSE by Fri night).

Days 11–13 Weather Summary

A dusting of snow turning to light rain (total 3mm) on Mon afternoon. Freeze-thaw conditions (max 4°C on Mon night, min -5°C on Sat afternoon). Winds decreasing (gales from the W on Sat afternoon, moderate winds from the WSW by Sun night).

Thu
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tuesday
30
Wednesday
31
Thursday
1
Friday
2
Saturday
3
Sunday
4
Monday
5
Tue
6
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
PM
night
AM
Wave Height Map
High Tide
11:57AM1.92m
00:15AM1.74m
12:39PM1.85m
1:11AM1.80m
1:27PM1.78m
2:14AM1.87m
2:21PM1.72m
3:17AM1.96m
3:18PM1.67m
4:16AM2.06m
4:17PM1.65m
5:14AM2.15m
5:18PM1.64m
6:13AM2.20m
6:24PM1.65m
7:16AM2.24m
7:32PM1.70m
8:17AM2.27m
8:33PM1.78m
9:12AM2.28m
9:27PM1.84m
10:02AM2.25m
10:15PM1.88m
10:49AM2.18m
Low Tide
5:53PM0.62m
5:52AM0.75m
6:36PM0.60m
6:53AM0.79m
7:22PM0.59m
7:58AM0.82m
8:14PM0.58m
9:11AM0.82m
9:14PM0.58m
10:26AM0.80m
10:24PM0.55m
11:35AM0.73m
11:28PM0.50m
12:33PM0.67m
00:25AM0.43m
1:25PM0.60m
1:16AM0.39m
2:14PM0.54m
2:04AM0.39m
3:01PM0.51m
2:51AM0.44m
3:47PM0.50m
3:40AM0.51m
Wave
height (m) 
direction
period (s) 
3.5
SSE
12
2.5
SE
11
2.1
SE
11
2.5
SE
11
5.5
SE
12
4
SE
12
2.5
SE
11
1.8
SE
10
1.7
S
10
1.7
S
9
1.5
S
9
1.2
SSW
8
1.1
SSE
9
0.8
ESE
12
2.5
SSE
6
3.5
SSW
8
5
SW
12
5.5
SW
13
5
SW
13
4
SW
12
3.5
SW
11
4
SW
11
3
SW
11
2.1
SW
10
1.6
SW
9
4
SSE
8
4
SSE
9
4
SW
10
3.5
SW
10
2.5
SSW
10
2.3
SSW
9
2
SSW
9
1.7
SSW
8
2
SW
7
2.3
SW
8
2
SW
8
mod snow
snow showers
cloud
light snow
heavy snow
light rain
light rain
light snow
cloud
cloud
part cloud
part cloud
clear
part cloud
mod rain
cloud
light snow
cloud
cloud
cloud
mod rain
snow showers
part cloud
cloud
cloud
light snow
rain showers
part cloud
snow showers
part cloud
part cloud
cloud
cloud
light rain
light rain
part cloud
mod snow
snow shwrs
cloudy
light snow
heavy snow
light rain
light rain
light snow
cloudy
cloudy
some clouds
some clouds
clear
some clouds
mod rain
cloudy
light snow
cloudy
cloudy
cloudy
mod rain
snow shwrs
some clouds
cloudy
cloudy
light snow
rain shwrs
some clouds
snow shwrs
some clouds
some clouds
cloudy
cloudy
light rain
light rain
some clouds
 km/h
45
NW
35
WNW
20
NNE
50
NE
70
NE
35
NNE
25
NNW
25
WSW
25
SW
20
SSW
25
W
30
WNW
20
WNW
10
SE
35
SSW
45
SW
50
SW
50
SW
45
WSW
40
SW
55
SW
45
W
30
WSW
25
SW
25
SSE
55
SE
50
WSW
55
W
45
W
35
WSW
30
WSW
25
WSW
30
SSW
35
SSW
35
W
35
W
 mm 
1
3
1
10
8
16
1
1
2
max°C
0
0
-3
-3
2
2
2
1
0
0
1
1
1
1
5
3
1
-1
0
1
2
-4
-3
-2
0
5
5
-3
-3
-3
-3
-2
1
3
4
0
Moonrise
11:27
11:43
12:01
12:22
12:49
1:25
2:14
3:20
4:39
6:03
7:26
Moonset
10:22
11:35
12:51
2:10
3:33
4:59
6:22
7:35
8:32
9:13
9:43
10:06
Sunrise
7:54
7:56
7:56
7:56
7:56
7:56
7:56
7:56
7:56
7:56
7:56
7:56
Sunset
4:27
4:28
4:29
4:29
4:30
4:30
4:31
4:32
4:34
4:35
4:36
4:37
Today's sea temperature in Great St Lawrence is
3.1° C
(Statistics for 25 Dec 1981-2005 – mean: 2.8 max: 5.2 min: 1.1°C)
Issued (local time): 1 pm Thursday 25 Dec 2025
Forecast update inUpdates in  hr  min  sUpdate imminent
Nearest locationNearest